In the last year, half of the stuff that's come through my post production house for editing and DVD authoring had been T-girl stuff.
Not my personal cup-o-tea but it helps pay the bills (I usually hand it off to one of my contract editors to work on).
I can only assume that a large population of closet homos exist that feel they can deny their predilections as long as there are tits involved.

A boat load of this crap comes from Brazil and Thailand, but I've noticed an increasing trend of American Trannies as well.
oh well. Whatever floats your boat. As long as I can keep filming young and/or beautiful girls taking dick (you know, girls without a "Y" chromosome), then who am I to complain what others want to pay for.